Locking cannula



FIG. 1 is a perspective view of a locking cannula, showing our new design;

FIG. 2 is a side elevational view thereof, the opposite side elevational view being identical;

FIG. 3 is a top plan view thereof, the bottom plan view being identical;

FIG. 4 is an end elevational view thereof, taken from the left of FIG. 2; and

FIG. 5 is an end elevational view thereof, taken from the right of FIG. 2. 

The ornamental design for a locking cannula, as shown and described. 